The true soil stress–strain response and shear strength behaviour

Soil settlement is normally quantified using conventional soil volume change models which are solely based on the effective stress and the role of shear strength is ignored due to the difficulties to incorporate in the framework. The Rotational Multiple Yield Surface Framework (RMYSF) is a soil volume change model developed from the standpoint of the interaction between the effective stress and shear strength. RMYSF incorporates the development of mobilised shear strength within the body of the soil whenever the soil is subjected to anisotropic compression. Currently the framework has been applied to predict the soil anisotropic stress-strain behaviour at any effective stress. This paper present the enhancement of this volume change framework using normalisation of axial strain with the understanding that the failure axial strain is not unique, but increases as the effective stress increases. This technique has essentially produced a better accuracy in the prediction of the stress-strain response for Malaysian residual soils. A series of drained tri-axial tests under various effective stresses has been conducted using specimens of 50mm diameter and 100mm height and from the stress-strain curves the inherent mobilised shear strength envelopes at various axial strains have been determined. These mobilised shear strength envelopes were then applied for the prediction of the soil stress-strain response. An excellent agreement between the predicted and the actual stress-strain curves has been achieved.

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First Principles Study on Shear Deformation of TIN/BN/TIN Interface

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.502 ◽

2011 ◽

Vol 335-336 ◽

pp. 502-505 ◽

Cited By ~ 1

Author(s):

Wei Gao ◽

Fei Xie ◽

Ke Jun Jia

Keyword(s):

Shear Stress ◽

Shear Strength ◽

Shear Deformation ◽

Deformation Mechanism ◽

First Principles ◽

Calculation Method ◽

First Principles Calculation ◽

Strain Response ◽

Stress Strain ◽

Shear Process

To obtain a view of the shear deformation mechanism, ideal shear strength and hardness in superhard nanocomposites nc-TiN/a-BN films, we studied, using the first-principles calculation method, the shear stress-strain response of a theoretical interfacial system TiN/BN/TiN, which consists of two TiN slabs and one sandwiched BN monolayer. The shear process showed that decohesion happens at the Ti-N interplanar bonds next to the interface. The calculated results show that the TiN/BN/TiN interface has the hardness that can match the TiN/SiN/TiN syatem.

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Triaxial Compression of a Cohesive Soil with Effective Octahedral Normal Stress Control

Canadian Geotechnical Journal ◽

10.1139/t65-004 ◽

1965 ◽

Vol 2 (1) ◽

pp. 40-52 ◽

Cited By ~ 5

Author(s):

R L Kondner ◽

J M Horner

Keyword(s):

Shear Strength ◽

Normal Stress ◽

Triaxial Compression ◽

Cohesive Soil ◽

Deviatoric Stress ◽

Strain Response ◽

Compression Tests ◽

Ultimate Shear Strength ◽

Stress Strain ◽

Stress Control

The influence of the first invariant of the effective stress tensor upon the deviatoric response of a cohesive soil is investigated. Triaxial compression tests with effective octahedral normal stress control show the deviatoric stress-strain response to be definitely affected by the value of the effective octahedral stress, [Formula: see text]. The values of [Formula: see text] range from 7.5 psi to 30.0 psi. For a constant value of strain, the deviatoric stress increases with an increase in [Formula: see text]. The ultimate shear strength can be approximated as a linear function of [Formula: see text]. Hyperbolic representation of the stress-strain response provides a convenient method for obtaining a measure of the ultimate shear strength using the response of stress states other than failure. The deviatoric stress-strain response as a function of the effective octahedral stress, [Formula: see text], can be expressed in the normalized form[Formula: see text]where ε is the strain, [Formula: see text] is a measure of the shear strength expressed in terms of [Formula: see text] , and A as well as B are numerical coefficients.

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Nonlinearity of Soil Stress-strain Response from Laboratory Studies

Near Surface 2009 - 15th EAGE European Meeting of Environmental and Engineering Geophysics ◽

10.3997/2214-4609.20147124 ◽

2009 ◽

Author(s):

E.A Voznesensky

Keyword(s):

Strain Response ◽

Laboratory Studies ◽

Stress Strain ◽

Soil Stress

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Experimental Characterization of Mechanical Behavior of Cord-Rubber Composites

Tire Science and Technology ◽

10.2346/1.2150974 ◽

1982 ◽

Vol 10 (1) ◽

pp. 37-54 ◽

Cited By ~ 11

Author(s):

M. Kumar ◽

C. W. Bert

Keyword(s):

Response Characteristic ◽

Cord Compression ◽

Complete Characterization ◽

Strain Response ◽

Strain Gages ◽

Experimental Characterization ◽

Rubber Composites ◽

Stress Strain ◽

Strain Data

Abstract Unidirectional cord-rubber specimens in the form of tensile coupons and sandwich beams were used. Using specimens with the cords oriented at 0°, 45°, and 90° to the loading direction and appropriate data reduction, we were able to obtain complete characterization for the in-plane stress-strain response of single-ply, unidirectional cord-rubber composites. All strains were measured by means of liquid mercury strain gages, for which the nonlinear strain response characteristic was obtained by calibration. Stress-strain data were obtained for the cases of both cord tension and cord compression. Materials investigated were aramid-rubber, polyester-rubber, and steel-rubber.

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